Concurrency improvements

[sergzin]

Introducing the run_as_async function to enhance concurrency by enabling the execution of loop-blocking code in a separate thread. Additionally, localizing the dis_client variable within a function scope to prevent potential data races.

[craigpratt]

I think we should consider making this async as part of an effort to remove the dependency on quart.

Quart was a transition technology prior to other libraries/frameworks implementing async request processing. But it's now holding back updates to some of the dependent packages.

I propose 2 criteria for the package to use in place of Quart:

1. The new request package doesn't require the use of an WSGI/ASGI (a web frontend) - as the DIS client doesn't need to horizontally scale.
2. We use packages from the Python standard library.

Now something like FastAPI might be overkill - and think goes counter to (2) - but wouldn't want to rule it out. But something like Django is definitely "out" IMHO.